diff --git a/deps/v8/src/platform-posix.cc b/deps/v8/src/platform-posix.cc index ad74eba8d99..3c868688ae7 100644 --- a/deps/v8/src/platform-posix.cc +++ b/deps/v8/src/platform-posix.cc @@ -188,19 +188,37 @@ int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) { double OS::TimeCurrentMillis() { - struct timeval tv; - if (gettimeofday(&tv, NULL) < 0) return 0.0; - return (static_cast(tv.tv_sec) * 1000) + - (static_cast(tv.tv_usec) / 1000); + return static_cast(Ticks()) / 1000; } int64_t OS::Ticks() { +#if defined(__linux__) + static clockid_t clock_id = static_cast(-1); + struct timespec spec; + if (clock_id == static_cast(-1)) { + // CLOCK_REALTIME_COARSE may not be defined by the system headers but + // might still be supported by the kernel so use the clock id directly. + // Only use CLOCK_REALTIME_COARSE when its granularity <= 1 ms. + const clockid_t clock_realtime_coarse = 5; + if (clock_getres(clock_realtime_coarse, &spec) == 0 && + spec.tv_nsec <= 1000 * 1000) { + clock_id = clock_realtime_coarse; + } else { + clock_id = CLOCK_REALTIME; + } + } + if (clock_gettime(clock_id, &spec) != 0) { + return 0; // Not really possible. + } + return static_cast(spec.tv_sec) * 1000000 + (spec.tv_nsec / 1000); +#else // gettimeofday has microsecond resolution. struct timeval tv; if (gettimeofday(&tv, NULL) < 0) return 0; return (static_cast(tv.tv_sec) * 1000000) + tv.tv_usec; +#endif }